Re: ENs Published in the OJ
Hello Richard, The EU recently ( at the end of January) updated their site which details ENs vs Directives. You can find a link to it (as well as to hundreds of other electrical product safety resources) on the Safety Link at: http://www.safetylink.com Just drop down to the sub-section titled, "Safety Articles, FAQs, MRAs, Etc" and look for the link titled, "DGIII's (EC) Reference to Harmonized Standards " Regards, Art Michael, Editor * * * * * * * * * * * * * * * * * * * * * * * International Product Safety News * *Check out our current offer on the * * Safety Link at http://www.safetylink.com * * * * * * * * * * * * * * * * * * * * * * * -- On Fri, 27 Mar 1998, WOODS, RICHARD wrote: > Is there a reliable, up-to-date web site that lists the ENs that have > been published in the OJ? > > Richard Woods > Sensormatic Electronics > wo...@sensormatic.com >
ENs Published in the OJ
Is there a reliable, up-to-date web site that lists the ENs that have been published in the OJ? Richard Woods Sensormatic Electronics wo...@sensormatic.com
Re: IEC contact information
hei...@tuv.com,Internet writes: > >Next week the SEMICON Europe (check out http://www.semi.org) is held in >Geneva >I will be there and want to inform myself about the workings of the IEC. >I thought they had an office in Geneva but was unable to locate any >contact, name, telnumber etc. >The IEC website is very spars. >Does anybody have such information? > > >Matthias R. Heinze >TUV Rheinland > > > > >--- Internet Message Header Follows --- >X-Moderator-Address: emc-pstc-appro...@majordomo.ieee.org > Here is the last information I have as of 6-2-97: IEC 3, rue de Varembe P.O. Box 131 1211 Geneva 20 Switzerland 41-22-919-0211 phone 41-22-919-0300 fax. i...@iec.che-mail Regards, Scott s_doug...@ecrm.com
Re: IEC contact information
Mr heinze and group IEC Centre du service Clientèle Commission Electrotechnique Internationale 3, rue de Varembé CH 1211 Genève 20 Suisse Fax +41 22 919 03 00 They understand English Regards, Gert Gremmen Ing -Oorspronkelijk bericht- Van: Matthias R. Heinze Aan: 'emc-p...@majordomo.ieee.org' Datum: vrijdag 27 maart 1998 15:14 Onderwerp: IEC contact information > >Next week the SEMICON Europe (check out http://www.semi.org) is held in Geneva >I will be there and want to inform myself about the workings of the IEC. >I thought they had an office in Geneva but was unable to locate any contact, name, telnumber etc. >The IEC website is very spars. >Does anybody have such information? > > >Matthias R. Heinze >TUV Rheinland > > >
EN50130-4 Rated Video Security Cameras
Hello Group, I'm going to be doing some immunity testing for a system that will have security video cameras attached to it. As we do not make cameras ourselves I need to get hold of some PAL units that have passed EN50130-4 (family product spec for security devices. This norm specifies levels generally associated with heavy industrial specifications). This device should also meet EN55022 Class B. Does anyone know of such a vendor? Thanks for your help! Regards, Kevin Harris Compliance Engineering Manager Digital Security Controls 1645 Flint Road Downsview, Ontario CANADA M3J 2J6 Tel 416 665 8460 Ext. 378 Fax 416 665 7753
RE: IEC contact information
The IEC Office is located at 3 rue de Varembe. This is almost across the street from the International Conference Center in Geneva. Unfortunate I don't have a phone number John Mowbray > -Original Message- > From: Matthias R. Heinze [SMTP:hei...@tuv.com] > Sent: Friday, March 27, 1998 3:38 AM > To: 'emc-p...@majordomo.ieee.org' > Subject: IEC contact information > > > Next week the SEMICON Europe (check out http://www.semi.org) is held in > Geneva > I will be there and want to inform myself about the workings of the IEC. > I thought they had an office in Geneva but was unable to locate any > contact, name, telnumber etc. > The IEC website is very spars. > Does anybody have such information? > > > Matthias R. Heinze > TUV Rheinland >
re: emi interference
Scott Douglas wrote: >Here's a problem for you all to think about and hopefully help solve. >I have a room in the corner of my building where I perform EMI >pre-scans. >Occasionally throughout the day I have a major interference show up on >my >analyzer. It does not come from the EUT. This is broadband, from 30 MHz >to >1 GHz, at levels up to 70 or 80 dBuv. It is not like a flat carrier but My vote is for flourescent light fixtures in need of repair. I had very similar problem. I used an underground hallway for pre-compliance scans. Very low ambient. Once in awhile ambient was swamped very broadband, made testing impossible. I went all around the plant looking for sources. Even turned out the lights in shipping dept. then went to turn them back on and found out they were mercury or sodium and took 1/2 hour to come back on! oops, sorry guys. Turned out to be an emergency exit flourescent fixure right near my testing. eric henn...@fp.com
Re: EMI Site Interference
Hello group, On our OATS, located in a big hall, a burglar alarm from the 80ties caused broadband noise 20 -150 Mhz Long lines , bad design etc. This was continuous interference so easy to locate. Regards, Gert Gremmen --- == Ce-test, Qualified testing == Consultants in EMC, Electrical safety and Telecommunication Compliance tests for European standards and ce-marking Our Web presence: http://www.cetest.nl -Oorspronkelijk bericht- Van: Scott Douglas Aan: emc-p...@majordomo.ieee.org Datum: donderdag 26 maart 1998 23:42 Onderwerp: EMI Site Interference >Hello Group - > >Here's a problem for you all to think about and hopefully help solve. > >I have a room in the corner of my building where I perform EMI pre-scans. >Occasionally throughout the day I have a major interference show up on my >analyzer. It does not come from the EUT. This is broadband, from 30 MHz to >1 GHz, at levels up to 70 or 80 dBuv. It is not like a flat carrier but >rather more like PWM driven motor noise. It lasts from 15 seconds to 1 >minute in duration. Then ambient returns to normal. > >We are a typical ITE manufacture. Our Genrad tester, wave solder, air >compressors, motor generators, air conditioners, plumbing waste pumps do >not appear to be the cause although none have been absolutely ruled out. >The frequency and duration would seem to eliminate them however. > >We have swamp on one side, the interstate highway on another, fields on >the third and the town on the last side. The only potential source I can >find is a medical clinic about 350 meters away from us. They are the >nearest building (the next being twice that far) and have an X-ray >machine. Yesterday I went there at lunch and asked was the X-ray in use >that day and they said yes but could not tell me a specific time that it >was used. > >A software engineer here tells me that he has experienced radio problems >in the parking lot outside my corner of the building. When he parks in a >certain spot, his FM radio (the entire band) gets wiped out by a >zhhzhhzhhh kind of noise. Move the car several feet any direction the >problem goes away. This closely resembles what I see on the analyzer. Our >analog guru suggests it is not the x-ray system as x-rays only last a few >seconds. A one minute x-ray would burn you up he says. > >I never noticed this interference in another corner room of my building >diagonally opposite my present location nor have I noticed the FM radio >problem myself. > >Questions: >1. What are the possible sources of such interference? >2. Is the problem radiated or conducted? I suspect radiated as the signal >goes away when you disconnect the antenna from the analyzer. >4. Why does this problem show up in only a small specific location on our >property? >4. What are the potential solutions? > >I will be happy to answer any other questions you think of (if I can) and >I look forward to the interesting comments I will receive from you all. >Thanks in advance. > >Scott Douglas >s_doug...@ecrm.com > >
RE: EMI Site Interference
One way to find out where it comes from is by using a horn antenna because it is very directional. If you place the horn antenna on a turn table and connected it to a receiver. You should be able to find out which direction does the noise come from by turning the table. If the noise is identical from all directions then it must be the cables connecting to your receiver. Regards Vi -- From: Scott Douglas [SMTP:s_doug...@ecrm.com] Sent: 26 March 1998 18:15 To: emc-p...@majordomo.ieee.org Subject: EMI Site Interference Hello Group - Here's a problem for you all to think about and hopefully help solve. I have a room in the corner of my building where I perform EMI pre-scans. Occasionally throughout the day I have a major interference show up on my analyzer. It does not come from the EUT. This is broadband, from 30 MHz to 1 GHz, at levels up to 70 or 80 dBuv. It is not like a flat carrier but rather more like PWM driven motor noise. It lasts from 15 seconds to 1 minute in duration. Then ambient returns to normal. We are a typical ITE manufacture. Our Genrad tester, wave solder, air compressors, motor generators, air conditioners, plumbing waste pumps do not appear to be the cause although none have been absolutely ruled out. The frequency and duration would seem to eliminate them however. We have swamp on one side, the interstate highway on another, fields on the third and the town on the last side. The only potential source I can find is a medical clinic about 350 meters away from us. They are the nearest building (the next being twice that far) and have an X-ray machine. Yesterday I went there at lunch and asked was the X-ray in use that day and they said yes but could not tell me a specific time that it was used. A software engineer here tells me that he has experienced radio problems in the parking lot outside my corner of the building. When he parks in a certain spot, his FM radio (the entire band) gets wiped out by a zhhzhhzhhh kind of noise. Move the car several feet any direction the problem goes away. This closely resembles what I see on the analyzer. Our analog guru suggests it is not the x-ray system as x-rays only last a few seconds. A one minute x-ray would burn you up he says. I never noticed this interference in another corner room of my building diagonally opposite my present location nor have I noticed the FM radio problem myself. Questions: 1. What are the possible sources of such interference? 2. Is the problem radiated or conducted? I suspect radiated as the signal goes away when you disconnect the antenna from the analyzer. 4. Why does this problem show up in only a small specific location on our property? 4. What are the potential solutions? I will be happy to answer any other questions you think of (if I can) and I look forward to the interesting comments I will receive from you all. Thanks in advance. Scott Douglas s_doug...@ecrm.com
Re: EMI Site Interference
Scot, We had a problem at our lab that sounds very similar to yours. It turned out to be dirty power line insulators. We were in the midst of a drought at the time and the rains were not doing a good job cleaning the insulators. The dirt built up to the point that there was conduction through the impurities deposited on the insulators. The bztbztbzt sound, a result of the intermittent making and breaking of the connection through the dirt, was picked up on radios in the parking lot as well as on the spectrum analyzer. We called the power company, they came by to clean the insulators,and the noise seemed to go away. A couple of things to try when investigating whether dirty - or loose - power line insulators are the culprit: - Set the analyzer trigger to LINE. The noise will bunch up in groups of lines separated by about 1/60 sec - indicates relationship to 60 Hz - If you can, get a bat or large board and hit the power poles one by one while someone else watches the analyzer. The recieved emissions will change in amplitude and pattern in time with strikes to the poles with loose wire/insulators . The power company (PG&E) seemed to know all about this type of problem and was prepared to help. Give yours a call if you suspect power line. Good luck. Tom Cokenias EMC Consultant/Radio Type Approvals >Hello Group - > >Here's a problem for you all to think about and hopefully help solve. > >I have a room in the corner of my building where I perform EMI pre-scans. >Occasionally throughout the day I have a major interference show up on my >analyzer. It does not come from the EUT. This is broadband, from 30 MHz to >1 GHz, at levels up to 70 or 80 dBuv. It is not like a flat carrier but >rather more like PWM driven motor noise. It lasts from 15 seconds to 1 >minute in duration. Then ambient returns to normal. > >We are a typical ITE manufacture. Our Genrad tester, wave solder, air >compressors, motor generators, air conditioners, plumbing waste pumps do >not appear to be the cause although none have been absolutely ruled out. >The frequency and duration would seem to eliminate them however. > >We have swamp on one side, the interstate highway on another, fields on >the third and the town on the last side. The only potential source I can >find is a medical clinic about 350 meters away from us. They are the >nearest building (the next being twice that far) and have an X-ray >machine. Yesterday I went there at lunch and asked was the X-ray in use >that day and they said yes but could not tell me a specific time that it >was used. > >A software engineer here tells me that he has experienced radio problems >in the parking lot outside my corner of the building. When he parks in a >certain spot, his FM radio (the entire band) gets wiped out by a >zhhzhhzhhh kind of noise. Move the car several feet any direction the >problem goes away. This closely resembles what I see on the analyzer. Our >analog guru suggests it is not the x-ray system as x-rays only last a few >seconds. A one minute x-ray would burn you up he says. > >I never noticed this interference in another corner room of my building >diagonally opposite my present location nor have I noticed the FM radio >problem myself. > >Questions: >1. What are the possible sources of such interference? >2. Is the problem radiated or conducted? I suspect radiated as the signal >goes away when you disconnect the antenna from the analyzer. >4. Why does this problem show up in only a small specific location on our >property? >4. What are the potential solutions? > >I will be happy to answer any other questions you think of (if I can) and >I look forward to the interesting comments I will receive from you all. >Thanks in advance. > >Scott Douglas >s_doug...@ecrm.com
IEC contact information
Next week the SEMICON Europe (check out http://www.semi.org) is held in Geneva I will be there and want to inform myself about the workings of the IEC. I thought they had an office in Geneva but was unable to locate any contact, name, telnumber etc. The IEC website is very spars. Does anybody have such information? Matthias R. Heinze TUV Rheinland
EMF
What is EMF? It is written in a letter as EMC-EMF. <>
Re: EMI Site Interference
Hi Scott, You wrote: 1 GHz, at levels up to 70 or 80 dBuv. It is not like a flat carrier but > rather more like PWM driven motor noise. It lasts from 15 seconds to 1 > minute in duration. Then ambient returns to normal.> I've had a very similar problem, 20-30dB over limit, wideband from 30MHz to 1GHz. Once was continuous, and was found to be a fluorescent fitting in a corridor about 60 feet away inside the building. Another incident, with identical EMI characteristics, but happening about 4 times a day for durations of 1 to 2 minutes, was traced to a fluorescent fitting in the Secretaries toilet! The source may be closer than you expected. Just a suggestion, Chris Dupres Surrey, UK.
Fw: CE Technical Documentation
-- > From: rlanz > To: Farnsworth, Heber > Subject: Re: CE Technical Documentation > Date: Wednesday, March 25, 1998 9:09 AM > > I recommend, for clarity, you state which CE directives you are referring > to. For example a Technical File is used differently in the EMC and Low > Voltage Directive. The Medical Directive makes reference to a Design or > Technical Dossier, and could be subject to Notified Body inspection. This > would depend on the type of product. Summarily, all of these terms > describe documented evidence of compliance with the intended > specification(safety, emc, performance). You can add Device Record or > Device Master Record to the list; referred to in FDA regulations. > > Regards, > Richard Lanzillotto > Regulatory Consultant > rl...@concentric.net > > From: Farnsworth, Heber > > To: pstc Post Message (E-mail) > > Subject: CE Technical Documentation > > Date: Tuesday, March 24, 1998 10:20 AM > > > > > > Could someone point me toward definitions for the following terms (with > > regard to CE marking documentation) > > > > -Technical Documentation > > -Technical Documentation File > > -Technical Dossier > > -(other related terms) > > > > I'm having trouble explaining the difference. > > > > > > > > > >
Use of BeCu Gaskets
Greetings, A very good discussion about the use of BeCu gaskets. Thanks Just a note from the connector technology. This technology uses BeCu for much the same reason we do but there is the need for very low impedance between two mating and seperable connectors. In this case the materials and processing are very important so what is done is to clean the BeCu very rigously then Cu plate then Ni plate then plate the Co hard gold. There is or can become an insulating BeCu oxide where the contact impedance is vary high(we would use it). The Cu assures no growth of BeCu oxides. If the Cu is eliminated then the Ni serves the same function. It would be interesting if ever there was use of BeCu under harsh environmental conditions with sucess. In our case the BeCu is usually very clean and the contact pressure is very high. For EMC purposes insure the contact pressure is high, beyond the break thur point, and the oxiding environment is small otherwise we lmight have to do something like the connector industry. Thanks again for that enjoyable and interesting conversation. Richard Haynes
Re: EMI Site Interference
Scott I have a couple thoughts for you quick as they maybe given that I am trying to go home! :-) 1) Is the interference line-locked? Try triggering off the line freq once... 2) Is the building`s electrical supply underground? What are the ground water conditions like around your plant now, given the time of the year (spring) and being located near a swamp? 3) If you suspect that there might be a feeder problem, your local electric company should have a interfence dept where they will come out and look (with receivers) for leaky insulators, lightning arrestors, cables or ect. Our 10m OATS site at Waukesha has had that very same problem. good luck, dave garnier ge medical systems ultrasound engineering 414-647-4286 ps: the xray tube operates for a very little time, given that most of the power (kilowatts) goes up in heat. The emc radation from the tube and cables would therefore be of vary short nature.
RE: Technical Papers
Hi, Paul 40 years of IEEE symposia (1955-1995) are available on CD rom from AMC Applied Microfilm at (617) 893-7863. I don't know, however, if that includes symposia held outside the US. David Brumbaugh Boeing ISDS Electromagnetic Effects > -- > From: Paul Smith[SMTP:smi...@stranduk.com] > Sent: Thursday, March 26, 1998 12:27 AM > To: emc-p...@majordomo.ieee.org > Cc: smi...@stranduk.com > Subject: Technical Papers > > Hello all, > > Does anybody know where I could get hold of the papers presented at > the EMC International Symposium, Sendai, Japan from 1994 ? > Any information greatly appreciated, > > Regards, > Paul Smith > EMC Engineer > > Strand Lighting Ltd, > Mitchelston Industrial Estate, > Kirkcaldy. Fife. KY1 3LY > > Tel: 01592 652333 > Fax: 01592 653528 > e-mail: smi...@stranduk.com >
